Brush-making machine



Oct. 13, 1925- v 1.555.783

1 c. c. GRAY sausn MAKING MACHINE Filed June 21, 1923 6 Sheets-Sheet 2-IIIIIIIIIIIIII Ill ll 7117111110 n 1; filing); hwllllllll.ITIIIIIIIIIIIIIA V, (01 6. Gray 3 We wf Oct- 13, 1925- 1,556,783 c. c.GRAY BRUSH MAKING mcmufi Filed June 21, 1923 6 Sheets-Sheet 3 I Oct- 13,

1,556,783 c. c. GRAY BRUSH MAKING MACHINE Filed June 21 1923 6Sheets-Sheet 4 .l l l 47 t zs T Q :I 1/ I I I I I a V II v.

. 28/ (01d 6'- Gray Oct. 13, 192 1,556,783

'c. c. GRAY BRUSH MAKING MACHINE Filed June 21, 5 s sheets-sheet 5Jizmub Patented Oct. 13, 1925.

UNIT ED STATES 1,556,783 PATENT 'FFIGE.

can; ,0. early, or nrmaro-nls, 'nInNEso'rA, AssIe-NoR roeornna nnxrsncoM- raw, or mnnnroms, 'MInNEso'r-n, a ooaroanrron or ana e; i

BRUSH-MAKING nnonm-n.

Application filed June 21, 19,23. Serial are. 46,323.

To all whom it may concern.-

Be it known that I, CARL -C, G Y, a citizenof the United States,residing at Minneapolis, in the county of Hennepin and State I 15 ofMinnesota, .have invented certain new and useful Improvements inBrush-Making Machines; and I do'herebydeclare the following to be afull, clear, and exact description of the invention, such as Will enable1 others skilled in .the art to Which :it apperz'tains .to .make .anduse the same. i

"My invention relates to the broom or brush-making art and provides animproved apparatus whereby high grade :brooms or floor brushes .may berapidly made on a large commercial scale andat 10W manufacturing cost.

So far as the present "invention is concerned, the brush material'may beof any suitable character, but my improved machine Will be foundespecially serviceable for properly assemblingi-broomor brushmateri'alsuch' as T ampico, African bass, bassine, and the like,withinza trough-like sheet metal head.

When floor brushes are "provided with handles projecting in theplaneofthe brush material, ,they are frequently called brooms, but allsuch devices are, broadly speaking,

" brushes and, hence, for the purposes iofatliis case, I shallhereinafter speak rofwthe :floorbrushing device as a brush.

While the present improved machine is not limited to use for the making.of any specific typeof floor brush, it is, nevertheless, especiallywell adapted {for use in making floor brushes of the type disclosed andclaimed in my pending application Serial No. 615,006, 'filedJanuary 6,i923, and .entitled 'Floor bru-sh. The floor brush of said applicationcomprises a quite thin, preferably stamped metal, trough-like orchannel-shaped head within which the brush material, folded at itscentral portion, is securely tucked and firmly clamped by the insertedclamping'bar and cooperatin-gdevices, such as nut equipped boltsa-ndce1n entitious substance," such as gilsonite, itar pitch, or the like. II

Until very recently,'=litt' le progress has, for many years, been madein the art of making brushes andbrooms, fbut the introduction of brushor broommaterial such as :Tam'p'ico, African bass, and the like, "hasmade possible revolutionary changes both in ,the or broom structuresthemselves an 1 the a t of ak ng he same. Haw 111g first designed :andproduced a satisfacter-y ,floor brush or broom in any application aboveidentified, I then designed and .have produced a highly efficientcommercial JIIaQhI-IIB whereby the brush foizming ,ele-

ments may bequickly assembled in the most satisfactory. manner, and thiscommercial mach ne 1s gi -llustrated in the accompanying d wmgs, whereinlik characters indicate llke parts throughout the several ,views.

' Refer nghe d awi gs:

R g. :1 11s a perspective showing the improved machine; v

F g. 21s a fragmentary horizontal section .on the ,line '2 2 of Fig. 1;

F 1g. 3 is a perspective showing :the upper :PQlitilOHf-Qif themachineopened up; Y z F g. f4 .1s adetaijl in perspective showing one of ,theend tuft :holders; I

Fig. 5;1sa view partly in frontielevation .and partly n verticalsection, showingelevmerits of the ;brush and elements ;of b ush-assembng mechanis "o h ma- ;clrinle, it;he said ,parts being vertically sepa-Fig. 6 is a bottom plan viewof theruppen most element of vFig. :5,towit: the i-tucker .blade and showing also a fragment oflthe clamplng:bar of the ibrush structure, some .parts'being broken away;

Fug. :7 :is a front elevation" showinglthe upper portion of the machine,some parts be'1ng.; sectioned and. some parts ibeingibroken nwa.

Fig. :8 is an enlarged transverse section on rtherline:8e.8:of=Fig. 7; va 7 Figs. 9 and 10 areqviews corresponding to F1g.;8,;but illustratingdifferent stepscin the operation and different adjustments of the partsof the machine.

- :Fig. 11' is a fragmentarysection on Jthe dine111-lof Fig;x6;

ig.'12is a :fragmentaryview correspond- ;ing, mum .positionsof the.parts of the .machine, rto the illustration of Fig. 10:; I

:Fig; l3sisia perspective showing the completed floor brush; the handleibei-n'g removed therefrom but 'i'ini position :for application thereto;r i

:Fig. 14 is an and elevation o'rfstheibrush before .it: E has beenvtrimmed Fi-g.*i15 'is a section taken substantially :on the line 1515of Fig. 14;

Fig. 16 is a fragmentary side elevation illustrating a modified form ofthe machine;

Fig. 17 is a fragmentary front elevation with some parts sectioned onthe line 1717 of Fig. 16; and

Fig. 18 is a vertical section taken approximately on the line 18-18 ofFig. 17.

Before describing the machine, I will first briefly note the elements ofthe floor brush, the parts of which are, for illustrative purposes,assumed to be assembled by the use of myimproved machine. Thetrough-like pressed metal brush head or back is indicated by thecharacter a, the brush-forming material or fibre by the character I),the clamping bar by the character 0, and the gilsonite or similarcementitious material by the character d. The clamping bar 0 isconnected to the head a by small bolts f equipped with nuts 9. Throughthe central portion of the back of the head a are passed short bolts orscrews 70, which, as will hereinafter be noted, are used to clamp thebrush head to prongs of a ferrule m secured on the ends of brush handlen.

To afford a support for the broom material in the initial assemblingoperation, I provide a work table 20, which may be conveniently formedfrom two quite heavy boards rounded at their inner edges and spaced toform an assembling channel 21. lhese planks are shown as rigidly securedto brackets 22, which, in turn, are riveted or otherwise rigidly securedto parallel normally upright supplemental frame bars 23. These bars 23are rigidly connected but properly spaced by rivets 24 and spacingsleeves 25, with the opposing faces of the cooperating bar spaced toalign with the sides of the assembling channel of the table.

The transversely opposite front bars 23 are rigidly connected by a crosschannel bar 26 and at their lower ends, by means of rivets or bolts 27,are pivoted to the upper ends of frame pedestals 28. Here it will benoted that the bolts or rivets 27 afford pivots (see particularly Figs.8 and 9), on which the table 20 may be turned from the horizontalposition shown in Figs. 8 and 9 into the vertical position shown in Fig.10. The pedestals 28 are rigidly connected, as shown, by truss bars 29.

The assemblingchannel 21 is provided with a yielding or floating bottomin the form of a flat metal strip or bar 30 that normally occupiessubstantially the position shown in Fig. 8. Downward movement of thebottom strip 30 is limited by step brackets 31 rigidly secured on thetie-bar 26, (see particularly Fig. 7, 8, 9 and 10).

Upward movements of said bottom strip 30 are limited by guide bolts 32rigidly secured thereto at their upper ends and working'through guidebrackets 33 on the bar 26 with their headed lower ends normally heldagainst said brackets by coiled springs 34 that aiford the yieldingsupport for said bottom strip 30.

The upper portions of the laterally spaced pairs of supplemental bars 23afford suitable guides for an approximately horizontal cross-head bar35, the ends of which project outward of said guides, as best shown inFig. 7. Near one end, the bar 35 is provided with a pivot pin or bolt 36passed through vertical slots 37 formed in the flanges of the right-handbars 23.

Rigidly secured to and depending from the central portion of thecross-head bar 35 is a tucker blade or bar 38. Tucker blades or bars 38of appropriate length and design for brushes of different length ordesign will be provided and, hence, they are made detachable. As shown,the blade 38 is detachably secured to the bar 35 by nut-equipped bolts39. On its under edge, the blade 38 is provided with longitudinallyspaced pairs of cooperating spring clips or clamps 40 that are adaptedto embrace and frictionally hold the clamping bar 0 of the brush whenthe latter is pressed up to position against the lower edge of saidblade 38. The blade 38 has depending dowel pins 41 that are engageablewith dowel pin seats 42 in the back of the clamping bar 0 to properlyposition the same. Also, the blade 38 is formed with nut-receivingpockets 43, which, for square nuts, will be rectangular, as best shownin Fig. 6, so that they will receive and hold the nuts 9.

It will be noted by reference particularly to Fig. 5, that thetrough-like broom head a is provided with bolt passages f for the boltsf, and these passages. are arranged to align with larger passages 30 inthe channel bottom strip 30. The bolts 7c are passed through closelyfitting portions in the channel bottom strip 30 and position the broomhead (I with the bolt passages f aligned with the threaded perforationsof the nuts 9 held in the nut-receiving pockets 43 of the tucker blade38.

For holding the cross head bar 35 and tucker blade 38 down, as shown inFigs. 1,

9 and 10, there is provided a two-armed lever in the form of a bail 44,the prongs of which are pivoted each to one of the supplemental bars 23and extend across the ends of said bar 35. This bail is adapted to belocked in its downturned position by latch bars. 45, the ends of whichare adapted to be readily sprung into and out of engage ment with theprongs of said bail.

For forcing the bar 35 and its tucker blade 38 from its normally raisedinto its lowered operative position, I preferably provide a pair oflaterally spaced grab hooks 46 in the form of metal strips provided withoverturn-ed lug or hook-forming upper ends 47 and with intermediate 0blique or cam surfaces 48, which latter work through perforated guidelugs or keepers 49 secured on the pedestals 28. At their lowerpends, thegrab hooks46 are pivoted tojtheisideprongs of a treadle-actingfootoperated bail 50 that is pivoted at 51 to the pedestals 28., One ofthe prongs of the bail 50 is extended beyond. its. pivot and isconnected to the base of, the-adjacent pedestal by a coiled spring 52,which has sufficient tension normallyto hold the grab hooks-46-supplemental frame bars 23 in extreme positions of the table and affordstopstherefor., Fig. 2 shows one of two releasing cams 45, which, whenthe latch bars 45 are moved into vertical positions, spread the same, sothat the bail 44 will move pivotally,.'free from said latchbars.

s Operation.

As an initial step in the assemblingof .the partsof the brush, thetrough-like brush head a: is placed in the assembling channel 21 andupon the receding or depressiblebottom strip .=30.- To prevent fiuidadhesive materialfrom running through the bolt holes 7, a strip of thinpaper 79 is then placedon the bottom of said head and then the adhesiveor cementitious material d, such as gilsonite or tar pitch, is pouredinto the said head, about half filling the same, asshown in Fig. 8. p

Next, the tufts ofbrus-l-l'material for forming the main bodyof thebrush are laid cross-wise of the assembling channel and,

upon the upper edge of the brush heada, as-best shown in Fig. 3. In thepreferred manner of assembling this brush material, end tufts shown at12 Fig. 3, are laid in the 'plane of the assembling channel, and whenthis is done,the ends of said tufts b are placed inthe ends of thebrush; head, resting on the bows of the tuft holders' 53, and;thebody-formin'g tufts are laid over the lower ends of these end tufts.Sometimes it will be advisable to; pour a streak (i of the gilsonite oradhesive material on turned normal position, shown by. dotted 'linesinFig. l and by full linesin Fig. 3,

the nutsg are placed in the nut-receiving pockets 43-;0f the tucke'rblade 38 and then the-clamping bar; cis pressed betweenthe spring prongs40 with dowel pins 41 projecting through'th'e perforations42. -The nextstep in the operation. is to turn the. bar 35 down into its horizontalposition shown in Figs. 7 and. 8. Here it should'be noted that the pivotpin 36of the bar 35, working in the vertical slots 37, permits. said bar35 and tucker blade 38 to be moved vertically downward from the positionshown inFigs'Zand 8.

, The operator will now step on the treadleacting bail. 50-, therebymoving the, grab hooks 46 downward. Under initial downward movements ofthe grab, hooks, their cam surfaces 48 pass through the keeper 1brackets 49, thereby forcing the hook or .lug-equippedupper ends thereofinto engagementf with the projecting ends of the bar 35, so that undercontiniuad downward pressure and movement of the bail 50 and 1 the hooks46, thebail 35 will bepositively pressed downward, thereby causing. thetucker blade 38 to force the'ciampi-ng bar 0 against the tufts I), sothat thisact o-f forcing the clamping bar 0 into thetrough-like brushjhead a buckles the brush-forming tufts b andbends the endtufts bintosubstantially vertical positions, (see particularly Figs..;1 and 9).TO' then hold the bar 35 and-the other parts just noted in theirdoWn-pressed positions, the bail 44 is turned down onto saidbar 355'andthe latch ,bars 45 are applied to v the bail, as best, shown in Figs,1-and9. A 1 Y By reference to; Fig. 9,;i't will be noted that whenthe'brush elements ;a re pressed dwn as there showmby' the operationjust described, the yieldingbottom; strip sewer beforced down until itis engaged with the stop brackets 31 and then affords an unyielding-baseof reaction, which causesthe clamp: ing bar a to be forced tothelimitinto the brush'head a, Itwi-ll befurther noted-that whenthe brushelements, are thus forced downward, the sides of the assembling channel2 1'hold the brush-forming tufts by in upturned positions, The recedingbottom. 30 Of'zthQ assembling channel 21 holds the brush .head'anormally with its upper edge level withlthe top-of. the table'20, sothat the tufts, when laid out, flat, will -co ntact therewith; and underinitial downward movement. of theiucker blade, the tuftswillf be pressedat least partway downinto the; brush head. Under the above describeddownward pressing and buckling actionproduced by-the clampingpbar 0under the actionlf, the

' tucker blade 38, the brush-,form-ingftufts will not only bepositionediwi-th-in theiheadiand securely held by the clamping bar,;butwill be forced into the adhesive (Z and thereby very securely anchored.As soon as the bail 44 has been secured by the latch dogs 45 in theposition shown in Fig. 1, the operators foot may be removed from thebail 50, thereby permitting the spring 52 to throw the grab hooks upwardand back to their normal positions,'in which positions the hooks will,by the cam surfaces 48, be spread or forced outward so that they will beout of the path of movement of the cross head bar 35.

While in this position, the brush-clamping screws fmay be freely passedthrough perforations 30 in the receding bottom 30 and inserted throughthe perforations f of the clamping head a and through perforations 42 ofthe clamping bar 0 and screwed into the nuts 9, which, it will beremembered, are then held properly positioned within the pockets 42 ofthe tucker blade 38. In Fig. 12, this operation is illustrated as beingaccomplished by a screw driver A. The screws 73, it will be understood,were applied to the brush head a at the time or before the brush headwas applied in the assembling channel 21 and upon the receding bottom30. When the screws 7 have been properly tightened, the brush will beready for removal from the machine. Toaccomplish this, the table willpreferably be first again turned back into its horizontal position, Fig.9; and then the latch dogs 45 will be released from the bail 44 and saidbail will be turned back and over into its dotted line position shown inFig. 1. This releases the cross head bar 35 so that it, with its tuckerblade 88, may be turned upward and outward into its inoperative positionshown by dotted lines in said Fig. 1. When the brush is thus releasedfrom pressure, the springs 34 will force the yielding bottom 30 upwardto its normal position, thereby ejecting all of that part of the brushexcept the head at out of the assembling channel 21, thereby making it avery simple matter tolift the brush out of said channel.

The brush formed as just described will appear substantially as shown inFig. 14, but it should be cut off on the line marked g on said View, andthis may be readily done by a suitable trimming or shearing device. Thebrush is then completed, except for the brush handle n and ferrule m,and these latter may be quickly and easily attached to the head by firstinserting the perforated ends of the ferrule over the projecting ends ofthe bolts and applying suitable nuts, not shown, to the ends of saidbolts.

Brushes of the general character above outlined may be very rapidlyassembled or made by the use of this improved machine. In fact, the useof this improved machine has made possible the production of very highgrade floor brushes and the like at very low cost.

In the modified construction of the machine illustrated in Figs. 16, 1,7and 18, the pedestals 28 are employed, but in this instance, thesupplemental bars 23, which correspond to the bars 23, in some respects,instead of being pivotally connected to the pedestals, are rigidlyconnected thereto and extend upward therefrom and are spaced apart toafford suitable guides for the ends of the cross head bar 35, whichlatter is provided with the blade 38 of the construction previouslydescribed. In this form of the machine, the table 20 is made up of apair of leaves pivotally connected to the sup plemental bars 23 andspaced to afford the assembling channel for the elements of the brushand adapted to directly hold the brush head a.

The table-forming leaves 20 are secured to rock shafts 53, which, at oneend, have overlapping curved crank arms 54, the upper ends of which aresubject to the laterally bent end 55 of a depressible actuating rod 56arranged to slide through a keeper 57 on one of the pedestals 28. Whenthe rod 56 is drawn downward, the leaves 20 will be turned up, as shownin Fig. 18, but when the said rod is released, said leaves will drop, bygravity, into horizontal positions shown in Fig. 16.

In this modified arrangement, the brush head a is adapted to be forceddown against a bottom strip 58 that is fixed to the supplemental framebars 23; and a cross-head bar 35, at its free end, is provided with adepressing hook 59. The hook 59 is made from a short rod benthorizontally at its lower end to form a finger 60 that projects betweenthe crank arms 54 and, at its upper end, it is bent at 61 to form acombined stop and finger piece immediately above the bar 35. Thevertical portion of the hook 59 works through a perforation 62 in thelower flange and through an open notch 63 in the upper flange of the bar35 and is yieldingly held in the position shown in Fig. 17 by a lightspring 64 attached to the lower 'fiange of said bar. WVith thisarrangement, when the rod 56 is drawn'downward to cause thetable-forming leaves 20 to be turned upward, the bar 35 will also bedrawn downward.

For convenience of expression, the term floor brush will be used in theintroductory clauses of the claims, but it will be understood that thisterm is used in a broad and liberal sense and is intended to include,generally, brushes, brooms and the like.

WVhat I claim is:

1. A machine for assembling the elements of floor brushes, comprising atable having an assembling channel adapted to receive a channel-likebrush head, the table itself adapted to support brush material laidcrosswise of said head, and means for pressing a strip. 1

2. A-machine for assembling the elements of floor brushes, comprising atable having an assembling channel adapted to receive a channel-likebrush head, the table itself rdapted' to support brush material laidcross wise of said head, and means for pressing a clamping bar againstthe brush material and for buckling and forcing the same into said head,said assembling channelhaving an upwardly spring-pressed yielding bottomstrip, a

and means for limiting the downward movement of said bottom strip.

3. A machine for assembling the elements of floor brushes, comprising atable having an assembling channel adapted to receive a channel-likebrush head, the table itself adapted to support brush material laidcrosswise of said head and means for pressing a clamping bar against thebrush material and for buckling and forcing the same into saidhead,,said assembling channel having in its bottom openings throughwhich bolts may be inserted to connect the brush elements while held insaid channel.

4:. The structure defined in claim 1 in which the bottom strip of saidchannel has openings through which bolts may be inserted to connect thebrush elements while held in said channel.

5. A machine for assembling the elements of floor brushes, comprising atable having an assembling channel adapted to receive a channel-likebrush head, the table itself adapted to support brush material laidcrosswise of said head, and means for pressing a clamping bar againstthe brush material and for buckling and forcing the same into said head,the said table being mounted to move from substantially horizontal intosubstantially verticalpositions, and conversely.

6. The structure defined in claim 1 in which said table is mounted tomove from substantially horizontal into substantially verticalpositions, and conversely.

7. The structure defined in claim 1 in which said table is mounted tomove from substantially horizontal into substantially verticalpositions, and conversely, and in further combination with lockableclamping means movable with said table and operative to hold the brushelements assembled within said channel while they are being connectedtogether when said table is in an approximately vertical position.

8. A machine for assembling the elements of floor brushes, comprisinga'table having an assembling channel adapted to receive a channel-likebrush head, the table itself adapted to support brush material laidtransversely of said head, a vertically movable crosshead bar extendedabove said channel, a tucker bladecarried by said cross-head bar andhaving means for detachably holding the clamping bar element ofthebrush, and means for depressing said cross-head bar to thereby press!the clamping bar against the brush material and to buckle the latter andforce the same into the brush head.

9. A machine for assembling the elements of floor brushes, comprisingatable having an assembling channel adapted to receive a channel-likebrush head, the table itself adapted to support brush material laid ablecross-head bar extended above said transversely of said head, avertically mov channel and having frictional means for detachablyholding the clamping bar element of a brush, and means for depressingsaid cross-head bar to press the clampingbar against the brush materialand thereby buckle the latter and force the same into the brush head. Y

10. The structure defined in claim 8 in which said table is mounted formovements from substantially vertical to substantially horizontalpositions, and conversely, andis provided with guides that cause saidcrosshead bar to move with said table. U

"11. The structure defined in claim 8 in which said table is mounted formovements from substantiallyyertical to substantially horizontalposition, and conversely, and is provided with guides that cause saidcrosshead bar to move with said table, and in which said bar-depressingmeans includes foot-operated hook bars arranged to be detachablyinterlocked to the ends of said cross-head bar, when said table is inhorithe "eletransversely of said head, a vertically movable cross 'h eadEbar extended above said channel, a tucker blade carried by saidcrosshead bar and having means for detachably holding the clamping barelement of the brush, foot-operated hook bars engageable with the endsof said cross-head bar when depressed, and means independent of saidhook bars for locking said cross-head barin a depressed position.

13. A machine for assembling the elements of floor brushes, comprising atable having an assembling channel adapted to receive a channel-likebrush head, the table itself adapted to support brush material laidtransversely of said head, a vertically movable cross-head bar extendedabove said channel, a tucker'blade carried by said crosshead bar andhaving means for detachably holding the clamping bar element of thehaving an assembling channel adapted to rebrush, foot-operated hook barsengageable with the ends of said cross-head bar when depressed, andmeans independent of said hook bars for locking said cross-head bar in adepressed position, said means comprising a hand-operated bale andlaterally spaced bale-engaging latches.

14:. A machine for assembling the ele ments of floor brushes, comprisinga table ceive a channel-like brush head, the table itself adapted tosupport brush material laid transversely of said head, a verticallymovable cross-head bar extended above said channel, a tucker bladecarried by said crosshead bar and having means for detachably holdingthe clamping bar element of the brush, foot-operated hook barsengageable with the ends of said cross-head bar when depressed, andmeans independent of said hook bars for locking said cross-head bar in adepressed position, said means comprising a hand-operated bale andlaterally spaced bale-engaging latches, said table being mounted forpivotal movements from horizontal to vertical positions, and conversely,and said bale, bale latches and cross head barbeing arranged to partakeof the pivotal movements of said table.

15. A machine for assembling the elements of floor brushes, comprisingfixed pedestals, normally upright supplemental frame bars pivoted tosaid pedestals, a normally horizontal table secured to said supplementalframe bars and having an assembling channel, a cross-head bar workingover said channel and guided by said supplemental frame bars, a tuckerbar depending from said cross head bar and having spring-clampingmembers, for detachably holding the clamping bar of a brush, the head ofwhich is placed in said assembling channel, the bottom of said channelhaving openings through which bolts may be inserted to connect the brushelements, footactuated hook bars mounted on said pedestals andautomatically engageable and disengag'eable with the ends of saidcross-head bar to depress the latter when the table is in horizontalposition, and means associated with said table and movable therewith forlocking said cross-head bar in a depressed position independently of theaction of said hook bars.

16. A machine for assembling the elements of floor brushes, comprisingfixed pedestals, normally upright supplemental frame bars pivoted tosaid pedestals, a normally horizontal table secured to said supplementalframe bars and having an assembling channel, a cross-head bar workingover said chanel and guided by said supplemental frame bars, a tuckerblade depending from said cross-head bar having nut-receiving recessesand spring-clamping members, the latter to detach-ably hold the clampingbar of a brush, the head of which is placed in said assembling channel,the bottom of said channel having openings through which bolts may beinserted to connect the brush elements, foot-actuated hook bars mountedon said pedestals and automatically engageable and disengageable withthe ends of said cross-head bar to depress the latter when the table isin horizontal position, and means associated with said table and movabletherewith for locking said cross-head bar in a depressed positionindependently of the action of said hook bars.

17. The structure defined in claim 15 in which said cross-head bar ispivotally hinged at one end so that it may be turned up ward and awayfrom the table.

18. The structure defined in claim 8 in which said cross-head bar ishinged at one end so that it may be turned upward away from the table,for the purposes specified.

In testimony whereof I aflix my signature.

CARL C. GRAY.

